Wednesday, October 2, 2013

[Ichthyology • 2008] Gelanoglanis travieso • A New Species of Gelanoglanis (Siluriformes: Auchenipteridae) from the Marañon River (Amazon Basin), Northeastern Perú


Gelanoglanis travieso
Rengifo & Lujan 2008

Abstract
We describe a new species of driftwood catfish, Gelanoglanis travieso, (Siluriformes: Auchenipteridae) from the Marañon River, a whitewater tributary of the Amazon River in northeastern Perú. It shares with the two described species in this genus, G. stroudi, from left bank whitewater tributaries of the Orinoco River in Colombia and Venezuela, and G. nanonocticolus from blackwater tributaries of the upper Orinoco and Negro Rivers in Amazonas, Venezuela and northern Brazil, the following synapomorphies: reduced size, compressed body, conical snout, a single pair of mental barbels, premaxillae widely separated at rostral border of upper jaw, premaxillary and dentary tooth patches narrow, posterior naris long and narrow and positioned immediately anterior to orbit, and small eyes. Gelanoglanis travieso differs from all congeners in having second dorsal-fin lepidotrichium filamentous, simple, not a spine, and not serrate (shared with G. nanonocticolus); pectoral-fin spine stout, serrate along posterior margin (shared with G. stroudi); and a terminal mouth (vs. subterminal in G. nanonocticolus and G. stroudi).

Blanca Rengifo, Nathan K. Lujan, Donald Taphorn and Paulo Petry. 2008. A New Species of Gelanoglanis (Siluriformes: Auchenipteridae) from the Marañon River (Amazon Basin), Northeastern Perú. Proceedings of the Academy of Natural Sciences of Philadelphia. 157; 181-188 http://www.jstor.org/stable/27667790

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